Casting appliance



Oct. 14 1924.

. J. B. LADD CASTING APPLIANCE Filed Jan. 5.. 1923 Patented Oct. 14, 1924.

UNITED STATES PATENT OFFICE.

JAMES LADD, F ARDMORE, PENNSYLVANIA, ASSIGNOR T0 UNITED STATES CAST IRON PIPE & FOUNDRY COMPANY, OF BURLINGTON, NEW JERSEY, A CORPORA- TION 'OF NEW JERSEY.

CASTING APPLIANCE.

Application filed January To all whom it may concern:

Be it known that I, JAMES B. LADD, a citizen of the United States of America, and resident of Ardmore, in the county'of 6 Montgomery, in the State of Pennsylvania,

have invented certain new and useful Improvements in Casting Appliances, of which the following is a true and exact description, reference being had to the accompanying drawings-which form a part thereof. My invention relates to casting appliances especially adapted for use in connection with centrifugal molds and particularly designed for use where a core piece is required, as, for instance, in casting a pipe with a bell mouth. The object of my invention is to provide a core which, in itself and also in connection with appliances to be used therewith, can be made entirely of metal, so as to avoid the use of'molding sand which has heretofore been employed to' partly or wholly make up such cores.

The nature of my improvements will be best understood as described in connection with the drawings in whicha Figure 1 is a longitudinal section through one end of a centrifugal mold showing my improved appliance as it is used in connection with such molds Figure 2 isan enlarged View showing my improved appliance as shown in Fig 1..

Figure 3 is an end view ofthe inner end of the core iece.

Figure 4 1s a mom sectional View on the line H of Fig. 1.

Figure 5 is a sectional view showing a modification in the construction of my core piece.

Figure 6 is a cross sectional view on the line 66 of Fig. 5, and

Figure 7 is a perspective on an enlarged scale showing the usual mold appliances used in connection with the construction shown in Fig. 5.

A indicates the casing of the molding apparatus. B, the rotatable mold having an enlarged bell forming section indicated'at B, a peripheral flange indicated at B and a projecting ring indicated at B and formed with wedge holes, as indicated in Fi 1. The moldis also formed with a conica seat 13 for the core ring. C is the core ring shown in position on the seat B and held in position by wedges indicated at D. E, E indicate packing between the flange B of the 5, 1923. Serial No. 610,743.

rotatable mold and the casing A, said casing constituting, as indicated, a water jacket for cooling the mold.

F, Figs. 1, 2, 3 and, 4, is an annular metallic. core piece, the inner end of which is divided into tongues F by lon itudinally running slots indicated at F T e ends of the tongues F are referably chamfered, as indicated at F is an annular ring secured on the core F, as indicated, and having an outwardly projecting portion G surrounding the end in contact with the outer portion of the ring F and divided into tongues G by longitudinally running slots 1 G H is a thin metal shell preferably of sheet metal and having the conformation which it is desired shall be imparted to the bell mouth of the casting and, as shown, the ends H and-H of this shell rest upon the inner ends of the tongues F. and the outer ends of the ton es G. I indicates the casting and J t e end of a runner through which molten iron is introduced into the mold.

In the modification illustrated in Figs. 5, 6 and 7, the annular core here indicated at f is divided into tongues f by slots f running clear back to the core ring C and the outer portions of these tongues are further divided from each other by an annular slot f forming an additional set of tongues indicated at f. h indicates a thin metal shell havin the conformation of the head to be forme casting, the rest of the bell mouth being cast directly against the tongues f and f of the core'ring.

In operation the annular slotted core F is placed in position on the core'ring C and the thin shell H is placed in position on the tongues of the core, as indicated in Fig. 1; the parts being thus assembled the core ring supporting the core is inserted in the mold and locked in position as by the wedges D. The metal is then run into the mold, filling the space around the core as indicated in Fig. 1 and practically forming a union with the shell H. In solidifying and cooling the metal of the casting, of course, contracts but the pressure due to contraction comes upon the slotted tongues F and G which are sufliciently flexible to contract under this pressure and prevent any disruptive effect upon the casting. The casting being complete the casting is withdrawn from the in the bell mouth of the f mold and the core withdrawn from the casting leaving the shell H in use as a part of the casting.

pressure of the contracting casting so as to relieve the casting of disruptive strains and, at the same time, permit the extraction of the slotted core from the casting after it has solidified.

In any case where the slotted metal core comes in direct contact with the melted metal the slots must be so narrow that the metal Will not run. into them, this however does not involve any difficulty since the metal core is a good conductor and the melted metal'rapidly chills in contact With it. lVhere the shell pattern used covers the slotted core the slots may, of course, be made broader.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A casting appliance consisting of a metal core piece in combination with means for forming a depression in the casting consisting of a thin metal shell supported on the metal core piece.

2. A casting appliance consisting of a metal core piece made contractible under the pressure of a shrinking casting by slots in combination with means for forming a depression in the casting consisting of a thin metal shell supported on contractible portions of the core piece. V

3. A casting appliance consisting of a metal core piece made contractible under the pressure of a shrinking casting by slots in combination with a thin metal shell having the conformation of the inside of the 5. A casting appliance consisting [of an annular metallic core piece having an annular ring spaced from its main body enclosing its outer active portion, the inner portion of the main core piece and the outer portion of the ring being divided into elastic tongues by slots to make the core contractible.

6. A casting appliance consisting of an annular metallic core piece having .an annular ring spaced from its main body enclosing its outer active portion, the inner portion of the main core piece and the outer portion of the ring being divided into elastic tongues by slots to make the core contractible, in combination with a thin metal shell supported on yielding portions of the slotted core piece.

7. A casting appliance consisting of an annular metallic core piece having an annular ring spaced from its main body enclosing its outer active portion, the inner portion of the main core piece and the outer portion of the ring being divided into elastic tongues by slots to make the core contractible, in combination with a thin metal shell having the conformation of the inside of the'casting to be made enclosing and covering the core piece and supported on the outer ends of the tongues of the main core piece and the inner ends of the tongues of the annular slotted ring.

JAMES B. LADD. 

